hagemeyer



Dec. 7, 1937.

H. F HAGEMEYER APPARATUS FOR PRODUGING MOLDS 2 sheets-sheet 1 Filed June 29, 1936 Dec-'7, 1937. H. F. HAGEMEYER 2,101,677

APPARATUS FOR PRODUCING MOLDS l Filed June 29, 1936 2 sheets-shet 2 Ten ` that the mixture is churned and impacted against naar, ist? Application .was 29, lost. sensi No. sacas The invention relates to molding apparatus and is particularly adapted to be embodied in apparatus for producing` molds comprising calcined gypsum and asbestos pulp. i

In the production of molds of the kind-de scribed, a ii'ask oi' improved construction is preierably placed upon a match plate on which the pattern is formed or secured. The material from which the mold is 'formed may be o! any suitable proportions. -It has been found that excellent results may be obtainedby employing one huntired parts of molding material and one vhundred and sixty parts of water, these proportions being computed by weight. The molding material preferably comprises eighty ,percent (80%) by weight of calcined gypsum and twenty percent (29%) o! asbest'ds pulp. After the water and molding material are placed in the iiask it is necessary to agitatey the moldinglmaterial and the violently so that a homogeneous mixture will be obtained. The agitation must besuch the match plate and the pattern.' After the molding mixture has been violently agitated in the manner described. the molding 'materialbis permined to set. une mold is then withdrawn from the ask by means embodying the present invention, the'mold being then subjected to a drying operation before any molten metal is poured into it. `Fused metal at relatively high temperatures may be poured in the molds and the resulting p castings will be found to beextremely perfectl in conilguration'.4 It may be mentioned that the gases attending the pouring operation vent through the molding material which is extremely porous when dry. f

As indicated above. the present invention re- "^'lates to apparatus for withdrawing the molds from theiiask.. The apparatus, in its preferred form, includes means for subjecting one side of the mold to a partial vacuum so that the difierential in pressures on two sides 'of the mold cause it to be displaced relative to the flask and the match plate. method of withdrawing' the mold from the flask is exceedingly advantageous as the molds arenot broken or otherwise de' formed. p a i Other objects and advantages of the present invention will appear as the following detailed description progresses. reference being had'to` the' been withdrawn from the improved (ci. sz-ico) Fig. 2 is a top plan view of a suction plate which isutilized to subject one side oi' a mold to a partial vacuum. f Y

Fig. 3 is an enlarged fragmentary section taken on line 3-3 oi' Fig. 2.

Fig. 4 is a section taken on line H of Fig. 2, a mold, a ask and a match plate being shown in -connection with the suction plate.

Fig. 5 is a vertical section taken through an improved ilask and match plate.

Fig. 6 is s. section taken on line 6 6 oipFig. 5.l

Fig. '7 is a section taken through a valve Vwhich forms part of the improved apparatus.

Fig. 8-is a section taken through another valve which also forms part of the improved apparatus,

and

Fig. 9 is a perspective view of a mold which has `Referring to the drawingswherein a preferred'i reference. character In designates a base'piate adapted to rest upon any suitable support such as the door of a. factory (Fig. l). Projecting up' wardly from the base plate lil and secured thereto is a post il tok which a bracket i2is bolted. The bracket i2 is-provided with lugs it? having fgrooves M adapted to' receive the ends of a match plate l5. Detachably secured to the match plate I5 is a flask i8- and disposed within the match plate IB is a mold Il abutting against the bottom surface of the match plate I5. It willige noted that the match plate I5 is provided with a pattern I8. The construction of the match plate I5 and the iiask. IAB is described in detail in my c cpending application. Serial No. 37,922, nled lJune 22, 1936.

Disposeclgbeneath the bracket i2 and aligned with the mold i1 is a suction plate 20 secured to the upper end of a vertically disposed rod or y plunger 2l -which is siid'ably journalled in a bearing zz secured to the post il. A rack 2a tures to the plunger 2| meshes with a pinion 24 whichl may be rotated manually through the mediumoi' a handle 25. It will be. readilyV understood that ifthe handle 2B is rotated in a clockwise direction (Fig. 1) the suction plate 20 and the plunger 2i will be lowered and that .if the handle 25 is ro-' i vtated in the opposite. direction, the suction plate 2li and the plunger 2| Twill be elevated. 0bvi ously, the suctionplate 20 may be elevated until its upper surface abuts against the bottom s urface of the mold il. i

As best shown in Figs..2, 3 and 4, the suction .plate 20 has arectangular member 28 disposed j around it, the rectangular memberA 28 having a bevelled surface 29 at its upper edge. The suction plate 28 is provided with an integral rib 88 extending around it, the rib 38 being adjacent the bevelled surface 29 of the member 28.

Extending lengthwise of the suction plate 28 are a plurality of grooves 3| which open into a deeper groove 32 cut into the upper face of the suction plate 28. It will be noted that the grooves 32 extend substantially the entire distance between oppositely disposed parts of the rib 38. The upper surface `of the suction plate 28 is preferably provided with a recess or depression 35 which is preferably deeper than the groove 3|.

The groove 32 opens into a bore 81 in the suction plate 20. 'I'he bore 81 communicates with'a bore 38 in the upper end of the plunger 2| and the bore 38 communicates, in turn, through a pipe 39 with one end of a ilexible hose 48. The other end of the flexible hose 48 communicates with one opening of a three-way valve 42. Another opening of the valve 42 communicates through a pipe 43 with an opening in a threeway valve 45. The remaining opening of the valve 42 communicates ythrough pipes 46 and 41 to a tank 50. Disposed between the pipes 48 and 41 and forming a passage fromone to the other is a T-fitting 5| from which a pipe 52 extends downwardly. At the lower end of the pipe 52, a

valve 53 is provided. The purpose of this construction will presently appear.

As statedabove, one opening of the valve communicates with the pipe 43. A second opening of the valve 45 communicates with the atmosphere through a pipe 58. The third opening of the valve 45 communicates through pipe 88 with the discharge port of a vacuum pump 5I which is mounted on a bracket 53 secured to the post I i. The vacuum pump 8| is driven by means comprising a pulley 84 xed on a shaft 85 which forms part oi the vacuum pump. A belt trained over the pulley is also trained over a pulley 81' mountv ed on the shaft of an electric motor 88 which is -mounted on the base plate I8. The inlet port of the vacuum pump 8| is connected through pipe 18 with the tank 58. A vacuum gauge 12 communicates with the pipe 18 and indicates the pressure obtaining within the tank 58. Pipe 13 which communicates with the tank 58 at its lower end is provided with a valve 14 which may be opened soA that any liquid in the tank 58 may be drained therefrom. The three-way valves 42 and 45 are provided with valve handles 15 and 18, respectively, the free ends of the handles 15 and 18 being pivotally connected to a link 11. Pivoted to the free end of the valve lever 15 is a second link 88 which is also pivotally connected by a pivot pin 8| to one end of a foot treadle 82 which is pivoted intermediate its ends on a Pin 83 projecting from a bracket 84. The bracket 84 is fixed to the base I8. Pivoted to the link 88 intermediate its ends is a small link 85 which has one end of a tension spring 88 secured to it, the other end of the tension spring 83 being secured to an eye b'olt 89 which is screw-threaded in a bracket 88 mounted on the base I8. The spring 83 normally holds the valve levers or handles 15 and 18, the link 13, the link 88 and the foot treadle 82 in the positions wherein they are shown in full lines in Fig. 1. However, if the operator steps upon the outer end of the foot treadle 82 and displaces it into the position wherein it is shown in dotted lines in Fig. 1, the links 11 and 88 will co-operate to displace the valve handles 15 and 18 into the positions wherein theyare ,I

shown in dotted lines in Fig. 1. This displacement is against the action of the spring 88.

The Aoperation of the above described apparatus is substantially as follows: It is assumed that the mold |1 has been formed by practicing the method described in my co-pending application, Serial No. 87,922, filed June 28, 1936 and that it has not been subjected to the drying operation described in my co-pending application, Serial No. 91,897, filed July 22, 1936. However, the mold has been permitted to set and the match plate I5 has been inserted in the grooves I4 as illustrated in Figs. 1 and 4. The foot treadle 82 and the valve handles 15 and 18 are in the positions wherein they are shown in full line in Fig. 1. 'I'he pipe 68 then communicates with the atmosphere through the valve 45 and the pipe 58 but is adjusted so that the pipes 88 and 58'do not communicate with the pipe 43. The tank 58 communicates with the flexible hose 48 through the pipes 41 and 48, the T-tting 5| and the valve 42. The valve 42 is then adjusted so that the pipe 48 and the flexible hose 48 do not communicate with the pipe 43. The valve 53 has been adjusted so that some air may flow through it and the pipes 52 and 41 to the tank 58. It should be understood that the valve 53 may be adjusted to control the minimum pressure that will obtain in the tank 58 when the vacuum pump 8| is in operation.

Assuming that the vacuum pump 8| is in ope eration and that the mold I1 is in the position wherein it is shown in full lines in Fig. l, the operator manipulates the handle 25 to bring the suction plate 28 into contact with the mold (Fig. 4). A partial vacuum will be established immediately between the upper surface of the suction plate 28 and the adjacent surface of the mold I1. The entire bottom surface of the mold I1 will be subjected to this partial vacuum as air will be exhausted 4through .the grooves 3| and 32 and the bore 31. The operator will then manipulate the handle 25 .to lower the suction plate 28 and the mold I1 lwill follow the suction plate as a result of the differentials in pressures obtaining between the upper and lower surfacesl of the mold. .As soon as the suction plate -28 has been lowered sufdciently tol permit the operator to handle the mold without bringing it into contact with the ask I8, the operator steps upon the foot treadle 82 so that the valve handles 15 and 18 move into the positions wherein they are shown in dotted lines in Fig. l. The pipe 88 then communicates with the pipe 43 and the exible hose 48 through the valves 45 and 82 but the valve 45 is then adjusted so that the pipe 88 does not communicate with the pipe 58. The valve 42 is then adjusted so that the pipe 48 does not communicate with the pipe 43 or the flexible hose 48. Obviously, the exhaust opening from the vacuum pump 8| is then connected to the bore 31 and the grooves 3| and-32 through the pipe 88, the valve 45, the pipe 43, the valve 42, the

exible hose 48, the pipe 38 and the bore 88so that the partial vacuum between the suction plate 28 and the mold I1 is broken and a pressure above atmospheric pressure is obtained. The operator may then remove the mold I1 from. the suction plate 28 with little eiIort an d place it in the drying apparat/us. Meanwhile, the operator has released the foot treadle 82 to restore the apparatus to its original condition so that the above dcscribedv cycle of operations may be repeated.

During the operation ofj subjecting the mold |1 to a partial vacuum through the medium of Y so from the mold I1. .This water vpasses into the tankv 50 through the fleidble hose 40, the valvev 42 and the pipes I0 and 41. After an undesirlable amount of water has collected in the tank 50, it may b e drainedA therefrom by opening the valve 1 4. .Y

I claim:

1. Apparatus for withdrawing a mold from a match plate and a flask, which apparatus comprises" means for supporting the match plate and the flask, a plate having a surface with a plurali- .ty of grooves therein, said grooved surface being engageable with a surface of the mold, means for creating a partial vacuum insaid gr ves whereby said mold will adhere to said grooved plate when said grooved plate andiv said match 1 plate are displaced relative tov each other, and

means for causing relative displacement between said grooved plate: and said match plate.

2. Apparatus for withdrawing a mold from a l plurality of grooves therein, said groovedsurface being engageable with'said exposed'surface of said molding. means for creatingv a partial vacuum in said grooves whereby said moldwill adhere to said grooved plate when said grooved plate and saidl match plate are displaced relative to each other, andV means for causing relative 'displacement between said grooved plate and said match plate.

3. An appa tus for withdrawing a mold from a match plate and a ask, which apparatus comprises means for supporting the match plate and A the ask, a second plate havinga surface bounded by a rib extending around said plate. said rib being engageable with a surface of said mold, means for creating a partial'vacuum between said surface of said second plate and said surface of said mold whereby said mold will adhere 'to said second plate whenv said second plate andy said match plate are displaced relative to each other, and means for causing relative displacement between said match plate and said second plate.

4. An apparatus vfor withdrawing amold from a match plate and a flask, which apparatus comprises means for supporting the match plate and the flask, a second plate having a grooved surface bounded by a rib extending aroundsaid plate, saidv rib being engageable with a surface,

of` said mold, Vmeans for creating a partial vacuum in said grooves between said surface of said second plate and said surface of said mold, where?.

, for causing relative displacement between sai match plate andy said second plate.

v in Y r'. HAG. 

